New Zealand Journal of Geology and Geophysics abstracts
Kawiti Maar: phreatomagmatic activity in the Kaikohe-Bay of Islands volcanic
field, New Zealand
FRANZ MAY
Am Tieferbach 6
Auel
54597 Steffeln, Germany
email: may-auel@t-online.de
Abstract Geological and geophysical evidence indicates the
existence of at least one maar in the Kaikohe-Bay of Islands volcanic field.
The depression at the settlement of Kawiti has a central magnetic anomaly
resulting from the vent hidden beneath alluvial sediments. The size and shape
of the depression resemble maars from the type locality, Westeifel; in
addition, cauliflower bombs and spherical lapilli are present in the ejecta,
and these are typical products of phreatomagmatic eruptions. Observations at
two other eruption centres suggest that phreatomagmatic eruptions may have
occurred elsewhere in this volcanic field.
Keywords volcano; phreatomagmatism; geomagnetics; maar;
Northland
New Zealand Journal of Geology & Geophysics, 2000, Vol. 43:
147-155
0028-8306/00/4302-0147 $7.00/0 (c) The Royal Society of New Zealand
2000
PDF file of entire paper: medium quality (713K); (scanned from paper original: notes about this process)
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